Unaudited Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Costs and Expenses	$ 304,348	$ 310,171	$ 891,346	$ 913,768
REVENUES	398,456	385,149	1,121,634	1,099,331
Cost of Revenue [Abstract]
Fuel Costs	93,217	90,599	254,233	252,435
Cost of Goods and Services Sold	31,840	39,267	101,483	131,580
OPERATING EXPENSES:
Utilities Operating Expense, Maintenance and Operations	105,975	109,644	321,782	315,225
Depreciation and amortization	60,373	57,880	179,939	172,492
Taxes other than income taxes	12,943	12,781	33,909	42,036
OPERATING INCOME	94,108	74,978	230,288	185,563
OTHER INCOME / (EXPENSE), NET:
Allowance for equity funds used during construction	810	459	2,538	7,839
Interest Expense	(30,620)	(22,917)	(91,393)	(70,465)
Other Nonoperating Income (Expense)	(2,704)	124	(7,977)	(1,768)
Total other income and (expense), net	(32,514)	(22,334)	(96,832)	(64,394)
EARNINGS FROM OPERATIONS BEFORE INCOME TAX
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	61,594	52,644	133,456	121,169
Income Tax Expense (Benefit)	13,088	10,572	28,252	23,548
NET INCOME	48,506	42,072	105,204	97,621
Less: Dividends on preferred stock	803	803	2,410	2,410
NET INCOME APPLICABLE TO COMMON STOCK	47,703	41,269	102,794	95,211
Electricity [Member]
REVENUES	$ 398,456	$ 385,149	$ 1,121,634	$ 1,099,331